6 Key Terminologies

Term	Description
External System	All Revenue Management Systems (RMS) APIs require you to create an external system. This is so Oracle Hospitality OPERA Cloud knows for whom to process the request.
Throttling Limits	The Oracle Hospitality Revenue Management Systems (RMS) APIs are throttled. Throttling limits the number of concurrent calls to OPERA Cloud to avoid impacting day-to-day hotel operations. If more than 50 requests per second are received for a single OPERA Cloud environment, throttling helps maintain the day-to-day running of the hotel while still enabling API traffic.
Business Events	A business event is an event (that is, an update) that happens to a resource, for example, a reservation. Rather than getting the reservation repeatedly, subscribing to the Update Reservation event informs you when this or other reservations are changed. There are two methods for consuming events from Oracle Hospitality APIs: Polling and Streaming.
Streaming API	When you consume business event data from OPERA Cloud, you can choose which events an application will receive. These are the events to which the application subscribes. You can subscribe to business events from a specific environment, but approval from the environment owner is required. Additional information can be found on the Oracle Hospitality Innovation Week page.
Polling API	You can consume business event data from OPERA Cloud by polling, which refers to retrieving updates or new data from the server at regular intervals. Additional information can be found on the Oracle Hospitality Innovation Week page.
Application Key	A unique application key is created for each application upon registering an application in the Oracle Hospitality Developer Portal.
Scope	A static variable that represents the authorization scope and permissions granted to the client for accessing the APIs from OHIP.
Token	A header “Authorization” that includes the oAuth token obtained through Authenticating to Oracle Hospitality Revenue Management Systems (RMS) APIs.